Safety paper



JV/mim SH01 meu March 30 1926.

' J. W. NEFF SAFETY PAPER Filed oct. 24,`

DANEELEU CANE I Patented Mar. 30, .19.26,

UNITED As 'rkes 1,518,908 PATENT OFFICE. N'

JonN'wALLA'cE NEEE, on EAs'roN, rENNsYLvANIA.

.SAFETY rArEn.

'Application led 0ctober'24', 1923. Serial-No. 670,539.' l i Toallwjhmz'tmag/come'm."

Be it known that I, Jo'HN WALLACE NEFF,

citizen of the United States, residing at Easton, in the'county of Northampton and State of Pennsylvania', have invented certain new and useful Improvements'in Safety Paper, of which the following is'aspeciication.`

This invention relates to improvements in safety papers, and methods of making the same,'and more particularly to safety 'paper n for documentary papers and negotiable 1nfor alteration purposes.

struments, although I do not wish to be limited to that specific use.

In paper for this general use, it is necessary to protect Vusers thereof from fraudulentalterations of the matter printed or written thereon, by providing a paper which will show a change of appearance or color upon the application of a chemical designed Certain types of safety papers are now on the market on which are printed '.visiblv in -ink a word, such as ,"Void7 or Canceled,'andv which latter` are renderedinvsible or nearly so by theapplication of a fugitive tint design applied thereover, which is chemically .or'mechani- .cally removed upon application .of an eradicating substance. Other paper has impergnated therein, generally in thepulp stage, achemical substance havingthe ycharvacteristics of afugitive tint, either colored orv otherwise, `which changes appearance uponI the application of' altering or removing substances or solutions, but the chemicals used in this paper can be bleached off again by. one aware of their presence.. In

all of these types of paper, however, the

obvious disadvantage of many operations in manufacture .is present, and, likewise, the alteration preventative .characteristics are (more or less discernible and. removable to one desiring to alter the paper, suchv as a forger.

'A mam object of miy invention, then, is to provide a safety paper which is extremely sensitive to eradicatin solutions, so that the itself.

use of such willresu t in easy "andspeedy discernment. y

A further object of my invention is to provide in a safety paper a means of detection of fraudulent alterations, which means, being once discernible, cannot be removed or obscured without destroying the paper I A further object is to provide a safety paper having properties therein which will show an attempt at alteration, but which properties are not discernible before alteratlon. Y a

A further object is to provide-a safety ,paper which -willnot deteriorate with use nor` age, while, at the' same time, retaining equal, efficiency and utility resulting therefrom.

Other objects `will be in part obvious from the annexed drawing andin part. indicated from the following analysis ofthe invenf tion, in .which reference is made to' the accompanying drawing illustrating one embodiment-of .my idea.

In the drawing- Figure 1 shows a portionof'paper having invisible and warning indicia therein shown in dotted lines; and;

Figure 2 designates a portion of paper after an eradication solution or substance has been applied for alteration purposes.

My invention accordingly consists inl lprinting with a colorless and. (ineradicable chemical solutlon a word.such as Canccled",

-or Void on paper to be protected, in such a way that these words or other warning indicia are normally not visible. Upon the application of a bleaching chemlcal, or so- -called 4ink eradicators, a chemical reaction is set up which causes the invisibly printed' word to'change color -and to be readilyy disl c ernible. l l 4 The .most satisfactory vsolution .for the in.- visible printing agent .which I contemplate usin 1s a colorless-aniline solution, such as a so ntion of anilinev hydrochloride (CGH, NH,HCl.H,O) o r, as more commonly designated, of aniline-chloride or aniline salt. In .order to make this solution more stable and lastin inprinting, I pro ose to make the same s ightly acidlc by ady ing a small quantity of a suitable acid, such as sulphur-ous or" lmlriatic. The proportion of the `materials comprising the aniline solution is unimpor- 1 tant so long as the same is clearly, though chemical reaction set up produces with theinvisibly, impressed upon the paper.

In the drawings, 10 represents 4a paper suitable for use 1n documentary or negotiable instruments, vhaving impressed thereon by printingJ rollers orl the like invisible.

words Canceled, as at 11, in colorless form as by the aniline-chloride .solution hereinbef fore described. Upon the application `of ,'or the washing in, a bleaching agent, such as ink eradicator for altering purposes -the aniline-chloride soluti()n' `What is .known as aniline'-;black,a'nd the words standoutin .a black or dark brown color, clearly discernible, as at 12. The aniline-black,be

ing once established -and brought out in the aper, can be removed or destroyed only y boiling in sulphuric acid, which would, of course, destroy the paper. A The addition ofithe sulphu'rous or muriatic acid is not essential to my invention, but

. adds to the bodyand stability of the Warning indicia. So, also, I do not wish to limit myself'to the use of aniline-chloride, as any `colorlessaniline solution, or any other chemiover t cal solution which, upon the application of eradicators', would produce an ineradicable im ression, Wouldfunction as eliciently. t is seen from the above that my imroved safety paper and the method of proucing1 the same presents many advantages e types of safety'paper now in-use. The inventioncan be appliedto any kind of paper with equal facility, as no special paper 1s needed, and,'when applied, cannot be discerned. 'In manufacture and preparation, 'it

is evident that the invisible lettering can be applied by the ordinary printing roll, using the aniline solution. in place of ink thereon,

and no special type 'of machinery is, there-` V fore, necessary. Further, the application of the solution "is completed in a single operation, wherebyv the plurality of operations necessary in other types of safety papers is obviated. The aniline solution can rbe applied at any time d uring the preparation of the aper, and could even be applied to asizedJ paper Without injury or discernmentv of the same.

Without further analysis, the foregoing will so fully'reveal the gist of this invention that others can., by applying current knowledge, readily adapt it for various aps plications without omitting certain features that, from the standpoint of the prior art,

fairly constitute essential characteristics of ed to be rendered visible when the my name.

the generic or specific' aspects of. this inven tion, and, therefore, such adaptations should,

andare intended to be, comprehended with in the meaning and range ofl equivalency of the following claims.

. I claim:

1. A safety `paper having invisible warn- ;ing indicia printed thereon with a colorless chemical salt, said indicia being' rendered visible when the paper is treated with bleaching agents.

2. A safety paper having invisible warning indicia printed thereon with a .colrless-aniline salt, said warninggindicia adapt,F paper is treat-ed with bleaching'agents 3. A safety paper having invisible warn-4 ing indicia printed thereon with a colorless aniline-chloride -co1npound, said warning' aniline-chloride compound and a small quan-v tity of sulphurous acid, lsaid Warning indicia being clearly discernible upon the application of a bleaching agent to said. paper.

6. The method of making safety paper which consists in 4printing on the ypaper invisible warning indicia, which when dis` cernible, would inherentlynullify the paper, Y

with a colorless chemical salt.

7;. .The method` of making ,safety ypaper which consists in printing matter thereon, which, when discernible, would inherently nullify the paper,g with a colorless aniline salt. v

8. The method of making safety paper which.v consists in printing matter thereon with an aniline-chloride compound.

9.l The method of making safety paper which consists in printing Warning'indicia thereon with a colorless aniline-chloride compound, and stabilizing the warning-indicia.

by the-addition of 'a small quantity of sul-- phurous acid to said compound.

10. The method of making safety paper i which-consists'in printing normally invisible warning 1nd1c1a thereon with an anlline chloride compound which is slightly acidic. l

In witness whereof I have hereunto signed IoHN WALLACE NEFF. 

